I forgot about there being a cam 0 - I have two sets 0-22, one for DH's 403 and one for my 401. I've got a bunch of extras and I'm waiting until I get my Rocketeer to decide what to keep - I"ll want a complete set for that machine too.
Like Sheluma posted - there are a lot of them on Ebay - though on that listing there area lot of repeats, as the sellers keep listing the same item at the same price as the listing expires. I've seen items that have been relisted for over two years - and still there. I guess some sellers aren't all that concerned with actually selling their items.
There are more, newer cams, however they don't work on the mechanical machines so I've not paid much attention to them. I do have cam 23 is anyone is interested.